tec_socket_thread_pool.hpp

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// Time-stamp: <Last changed 2026-02-20 16:27:10 by magnolia>
/*----------------------------------------------------------------------
------------------------------------------------------------------------
Copyright (c) 2020-2026 The Emacs Cat (https://github.com/olddeuteronomy/tec).
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
------------------------------------------------------------------------
----------------------------------------------------------------------*/
#pragma once
 
#include <cstddef>
#include <atomic>
#include <vector>
 
#include "tec/tec_def.hpp"  // IWYU pragma: keep
#include "tec/tec_trace.hpp"
#include "tec/tec_thread_pool.hpp"
 
 
namespace tec {
 
class SocketThreadPool : public ThreadPool {
private:
    size_t buffer_size_; 
    std::vector<char> buffers_; 
    std::atomic<size_t> next_worker_index_; 
 
public:
    explicit SocketThreadPool(size_t buffer_size, size_t num_threads)
        : ThreadPool(num_threads)
        , buffer_size_{buffer_size}
        , next_worker_index_{0}
    {
        TEC_ENTER("SocketThreadPool::SocketThreadPool");
        //
        // Allocate thread buffers.
        //
        buffers_.resize(num_threads_ * buffer_size_);
    }
 
    char* get_buffer(size_t idx) const {
        // safe even if idx is huge
        return (char*)buffers_.data() + ((idx % num_threads_) * buffer_size_);
    }
 
    constexpr size_t get_buffer_size() { return buffer_size_; }
 
    size_t get_next_worker_index() {
        return next_worker_index_.fetch_add(1, std::memory_order_relaxed)
             % workers_.size();
    }
 
    virtual ~SocketThreadPool() {
    }
 
}; // class SocketThreadPool
 
} // namespace tec